Crop yield and soil available potassium changes as affected by potassium rate in rice–wheat systems

• Published in: Field crops research 2017-12, Vol.214, p.38-44
• Main Authors: Lu, Dianjun, Li, Changzhou, Sokolwski, Eldad, Magen, Hillel, Chen, Xiaoqin, Wang, Huoyan, Zhou, Jianmin
• Format: Article
• Language: English
• Subjects: Apparent K balance; K depletion; Potassium; Soil available K; Soil-extractable K
• ISSN: 0378-4290; 1872-6852
• DOI: 10.1016/j.fcr.2017.08.025

•We determined crop yield and soil K changes in a K deplete experiment.•Wheat yield loss was much higher than rice in unfertilized plot.•Soil K changes for NaTPB was more close to the theoretical soil available K changes. Large areas of the arable soils of the world are deficient in potassium (K) due to the low application rate of K fertilizer. However, current soil test methods cannot precisely determine soil available K changes. From 2009 to 2014, a field experiment was conducted in a rice–wheat cropping system in the Yangtze Plains using five K rates. The objectives were to determine the responses of wheat and rice yield to different K rates and to compare the soil available K changes extracted by three methods (ammonium acetate (NH4OAc), boiling nitric acid (HNO3), and sodium tetraphenylboron (NaTPB)). Long periods without application of K fertilizer markedly decreased wheat yield by 47% and rice yield by 15% compared with local farmers’ K practices (FKP, 90 and 120kgK2Oha−1 for wheat and rice, respectively). The FKP achieved optimal yields for wheat and rice; however, only 160% of FKP achieved a positive K balance for the cropping system. Soil-extractable K consistently decreased with increasing cropping rotations where the K rate was below 160% FKP for the three extraction methods. The extractable and changed amounts for the NH4OAC and HNO3 methods were significantly lower than that for the NaTPB method. The soil K changes for NaTPB were closer to the theoretical soil available K changes (TAKC) derived from an apparent K balance. The NaTPB method could be useful for accurately determining changes in soil available K in cropping systems.